JP2715563B2 - Powder filling equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a powder filling apparatus used for automatically filling a predetermined amount of powder into a powder filling section provided on a work table.

[Related Art] For example, in a tantalum capacitor, a die is filled with a predetermined amount of dielectric powder that is cured by pressing, and a wire is inserted into the dielectric powder thus filled in the die, and the die is pressed. It is manufactured by molding. In the manufacture, a die having a powder filling portion is mounted on a work table, a lower punch is provided below the powder filling portion, and a wire supply portion is provided above the lower punch. A molding machine provided with an upper punch unit provided with And
First, a predetermined amount of dielectric powder is filled in the powder filling section, and a wire is inserted into the dielectric powder in the powder filling section,
Pressure molding is performed by upper and lower punches.

Here, as a mechanism for filling the dielectric powder into the powder filling portion of the die, a cylindrical hopper having both ends opened is used. The dielectric powder is accommodated in the hopper, and the dielectric powder is brought into contact with the work table. It is configured such that the dielectric powder is dropped into the powder filling section by being moved by the hopper driving means on the powder filling section, and the hopper is driven on a work table. There are known one that reciprocates in a horizontal direction and one that revolves around a powder filling section. Here, in the reciprocating motion method, the hopper stops at the end of its both strokes. In the turning motion method, the hopper can be moved continuously during the powder filling operation. The powder filling efficiency is better in the system than in the reciprocating system.

[Problems to be Solved by the Invention] By the way, irrespective of the reciprocating motion method or the turning motion method described above, merely moving the hopper requires
The fluidization of the powder in the hopper cannot be sufficiently achieved,
Since the powder may not fall smoothly into the powder filling part due to a bridging phenomenon in which the powder stays around the powder filling part, it is necessary to quickly and efficiently fill the powder in a precise amount. There are things you can't do.

The present invention has been made in view of the above points, and has as its object to further increase the efficiency of the powder filling operation by fluidizing powder in a hopper more efficiently. .

[Means for Solving the Problems] In order to achieve the above-described object, the present invention provides a hopper having a cylindrical shape having at least a lower end opened, and a stirrer pin having a sharpened tip inside the hopper. Vertically, the tip of the stirring pin is opposed to the powder filling portion and extends to a position close to the opening end, and the hopper performs a turning operation centered on the mounting position of the stirring pin. It is characterized in that the driving means is connected.

[Operation] With the above-described configuration, when the hopper is moved, the turbulent flow is generated by relative motion between the powder in the hopper and the stirring pin inserted stationary in the powder. Does not occur, and the powder does not stay and cause a bridging phenomenon or the like, and falls into the powder filling portion very smoothly. As a result, the powder can be quickly and efficiently introduced into the powder filling section, and moreover, a certain amount of powder can be surely continuously charged into the powder filling section.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show the overall configuration of a powder filling apparatus. In the drawing, 1 is a work table, 2 is a die mounted on a through hole 1a provided in the work table 1, and 3 is a die 2
, 4 indicate lower punches provided in the powder filling unit 3 respectively. An upper punch unit 5 is provided above the lower punch 4. The upper punch unit 5 includes an upper punch for pressing powder and a wire feeder for inserting a wire 6 into the powder. I have,
Since the specific configuration of the upper punch unit 5 is well known in the art, a detailed description thereof will be omitted.

A hopper 10 is provided on the work table 1 described above. The hopper 10 is formed of a cylindrical member whose both ends are open, and contains therein the powder to be filled in the powder filling section 3. A swing arm 11 is connected to the hopper 10, and the swing arm 11 is reciprocally inserted through a fulcrum member 13 rotatably mounted on a movable plate 12 that is movable in a horizontal direction. . The other end of the turning arm 11 is connected to a connecting pin 16 projecting from an eccentric position of a crank pulley 15 attached to a motor 14 attached to the movable plate 12. As a result, when the motor 14 is operated, the crank pulley 15 rotates, and the connecting pin 16 provided at a position eccentric to the crank pulley 15 rotates, so that the turning arm 11 rotates around the fulcrum member 13. The hopper 10 is moved in the front-rear direction while swinging in the horizontal direction, whereby the hopper 10 is turned on the work table 1 in the horizontal direction about the powder filling unit 3 as shown in FIG. . Accordingly, the turning drive means for turning the hopper 10 by the motor 14 as the driving means, the clamp pulley 15 rotated by the motor 14, and the turning arm 11 connecting the clamp pulley 15 and the hopper 10 are provided. Be composed.

Further, a column 17 is erected on the movable plate 12 and a horizontal arm 18 is connected to the column 17. A stirring pin 19 is vertically provided at the end of the horizontal arm 18, and
The stirring pin 19 is extended to a position close to the opening end of the powder filling section 3 in the hopper 10, and its tip is a sharp conical portion 19a.

Thus, the movable plate 12 supporting the hopper 10 and the stirring pin 19
The hopper 10 and the stirring pin 19 are placed on the powder filling section 3 at a powder filling position enabling powder filling, and retracted from a position on the powder filling section 3 to lower the upper punch unit 5. , And can be displaced between a pressure forming position enabling the forming. When the hopper 10 is at the powder filling position, the hopper 10 can turn on the work table, but the stirring pin 19 is kept stationary even while the hopper 10 is turning.

The present invention has the above-described configuration, and its operation will be described below.

First, with the powder stored in the hopper 10, the movable plate
12 is displaced to the powder filling position. This allows the hopper
Numeral 10 is disposed at a position surrounding the top of the powder filling section 3 in the work table 1, and the conical section 19 a of the stirring pin 19 is placed at a position close to the open end of the powder filling section 3.

Therefore, when the motor 14 is operated, the crank pulley 15
Rotates, and the hopper 10 slides with respect to the work table 1 by rotating around the powder filling section 3 in which the stirring pins 19 are arranged opposite to each other. However, a stirring pin 19 installed at a position immediately above the powder filling section 3 is provided.
Is in a stationary state, the powder in the hopper 10 is stirred by the relative movement of the hopper 10 and the stirring pin 19, and the turbulent flow is generated. Therefore, fluidization of the powder is promoted,
The agitating pin 19 is guided along the conical portion 19a of the stirring pin 19 and smoothly and quickly falls into the powder filling portion 3 without causing stagnation due to a bridging phenomenon or the like. As a result, the powder is quickly and densely filled in the powder filling section 3.

When the filling of the powder into the powder filling section 3 is completed, the movable plate 12 is operated to retract the hopper 10 and the stirring pin 19 from the powder filling section 3 and lower the upper punch unit 5 and By pushing up the lower punch 4, the powder in the powder filling section 3 is pressed. At this time, the upper punch unit 5
, And the wire 6 is inserted into the molded product, and cut into a predetermined length. After that, the upper punch unit 5 is raised, the molded product is taken out, and the lower punch 4 is further lowered. Therefore, the movable plate 12 is again displaced to the powder filling position, and the same operation as described above is repeated, whereby the production of the molded product can be performed successively.

Since the hopper 10 is swirled and the powder in the vicinity of the powder filling section 3 in the hopper 10 is stirred by the stirring pin 19 to generate turbulent flow, the powder inside the powder filling section 3 Is promoted, the filling of the powder is completed in a very short time, and the same amount of powder is always filled, so that a molded product of uniform quality can be manufactured at high speed. become.

Note that, in the above-described embodiment, the powder filling apparatus has been described as being used for pressure molding. However, the powder filling apparatus according to the present invention is used to quickly and accurately fill a certain amount of powder into the powder filling section. And its use is not limited to this. In addition, although the hopper 10 has been described as having a revolving motion, it is needless to say that the present invention can also be applied to a case of performing a powder filling operation using a reciprocating hopper.

[Effects of the Invention] As described above, according to the present invention, the hopper has a cylindrical shape with an open lower end, and the stirring pin having a sharp tip near the opening end of the powder filling section in the hopper is in a stationary state. And the hopper is swirled by the swirling drive means around the stirring pin arranged opposite to the powder filling section. In addition to fluidizing the powder by the swiveling operation of the hopper, the hopper is stationary in the hopper. Stirring of the powder based on its relative movement with the stirring pin significantly promotes fluidization of the powder, and the powder in the hopper is guided into the powder filling section along the sharp tip of the stirring pin. And flow into the powder filling section quickly and effectively,
It becomes possible to perform an operation of filling a certain amount of powder accurately.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a cross-sectional view showing the entire configuration of a powder filling apparatus, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an operation explanatory view of a hopper. . 1: work table, 2: die, 3: powder filling section, 4: lower punch, 5: upper punch unit, 10: hopper, 11: swivel arm,
13: fulcrum member, 14: motor, 15: crank pulley, 17: support, 18: horizontal arm, 19: stirring pin, 19a: conical part.

Claims (1)

(57) [Claims] 1. A method for filling a powder into a powder filling section by bringing a hopper containing powder into contact with a work table and moving the hopper on a powder filling section provided on the work table. At least the lower end is formed in a cylindrical shape with an opening at the lower end, and a stirring pin with a sharp tip is set in a stationary state and vertically suspended inside the cylindrical shape. And a swivel driving means for performing a swivel operation centering on the mounting position of the stirring pin is connected to the hopper.